Point EC2 public IP address to subdomain

Question

I want to point a subdomain to an EC2 and I don't want to use Elastic IP and every time I start/stop the instance I want my subdomain point to the new Instance public IP address.

Answer 1

The easiest method is to use an Elastic IP address . It will remain attached to the instance and will not change. There is no additional charge for an Elastic IP address if it is attached to a running instance.

Alternatively, you could configure the operating system running on the instance to run a script whenever the instance starts. The script can update the DNS entry for the current public IP address associated with the instance . If you are using Amazon Route 53 for DNS, then you can make an API call that updates the A-Record to the current IP address being used by the instance.

I suspect it could be done with the change-resource-record-sets command in the AWS CLI.